export function hasClass(el, className) {
    let reg = new RegExp('(^|\\s)' + className + '(\\s|$)')
    return reg.test(el.className)
}
  
export function addClass(el, className) {
    if (hasClass(el, className)) {
        return
    }
    if(el.className === ''){
        el.className += className
    }else{
        let newClass = el.className.split(' ')
        newClass.push(className)
        el.className = newClass.join(' ')
    }
    
}

export function removeClass(el,className) {
    if (hasClass(el, className)) {
        el.className = el.className.replace(new RegExp('(\\s|^)' + className + '(\\s|$)'), '');
    };
}